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(Model.)

0. D. BROWN.

ALARM CLOCK.

No. 478,950. I Patented July 12, 1892.

QXMme aoeo WW P UNTTED STATES PATENT Orricn.

CHARLES D. BROXVN, OF AMES, IOVA, ASSIGNOR OF TVO-TIIIRDS TO ll. L. MUNN AND J L. STEVENS, OF SAME PLACE.

ALARM-CLOCK.

SPECIFICATION forming part of Letters Patent No. 478,950, dated July 12, 1892. Application filed October 24, 1891. Serial No. 409,739. (ModeL) To all whom it may concern:

Be it known that I, CHARLES D. BROWN, a citizen of the United States, residing atAmes, in the county of Story and State of Iowa,

have invented certain new and useful Improvements in Alarm-Clocks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which I0 it appertains to make and use the same.

This invention relates to alarm mechanism for use on clocks, more especially upon eightday clocks.

The object of the invention is to produce an alarm mechanism for eight-day clocks, which shall be so constructed as to require winding but once in that period and which will operate but once in twenty-four hours.

A further object is to produce an alarm 2a mechanism which maybe constructed and applied in a cheap and ready manner and which will be reliable and efficient in use.

lVith these objects in view the invention consists in an alarm attachment comprising an alarm-dial carrying a cam constructed with two tracks, one of which is cam-shaped for the purpose of releasing the drop-lever to start the alarm mechanism and the other circular in form and provided witha slot or passway whereby to permit the said lever to pass from the cam portion to the circular track to raise the drop-lever and thus stop the alarm mechanism.

The invention further consists in an alarmdial carrying a cam constructed with two tracks, one of which is cam-shaped and the other circular in form and provided with a passway to permit the drop-lever to pass from the cam portion to the circular portion, the latter portion being arranged in a plane approximately diagonal to that occupied by the cam portion, in combination with a drop-lever engaging the said tracks, and suitable alarm mechanism connected with the drop lever.

I have illustrated the invention in the accompanying drawings, in which- Figure l is a front elevation showing a clock-movement and an alarm mechanism, a portion of the clock-dial being broken away to show myimproved alarm-cam. Fig. 2 is a side elevation of the cam. Fig. 3 is a perspective View of the same, showing the droplever in engagement with the cam. Fig. 4

is an enlarged plan View of the alarm-dial, showing my improved cam in place thereon; and Fig. 5 is a detail perspective view of the drop-lever.

Referring to the drawings, A designates the dial of the clock, and B the hands. As these parts may be of anypreferred construction, a detailed description is deemed uunecessary.

C designates an alarmdial, to the sleeve of which is secured my improved alarm-cam D. This alarm-cam is constructed, preferably, in this instance of a piece of wire bent to form two tracks d (P, forming what maybe termed a figure-8 cam. The track (Z is circular and forms a bearing for the end of the droplever E during the period between the sounding of alarms, and the track or cam portion (1 is formed with a shoulder d for releasing the drop-lever at the proper time to sound the alarm.

It will be observed by reference to Fig. 2 that the track d is so bent at the shoulder (Z as to cause it to extend in rear of the latter and that the free end cuts diagonally across the track (1 and terminates over and in align- 8o ment with the free end of the cam portion, at which point a slot or passway d is formed. The object of this construction is such as to cause the drop-lever to be lifted up and out of the base of the shoulder (i and at the same time carry the lever rearward onto the track d by means of the hook or toe e on the end of the lateral arm 6 of the drop-lever, and the arm e bears upon the said track until the shoulder d again releases the said le- 0 ver to sound the alarm. As the sleeve of the dial 0 is secured on the hour-sleeve of the main shaft of the clock, it follows that the dial will make two complete revolutions in twentyfour hours, and with the ordinary alarm-cam the alarm would sound twice in that time. By constructing the alarm-cam with a double track, as described, the dial C has to make two complete revolutions before the drop-lever will be brought to the camroo shoulder (1 so that the alarm will only sound once in twenty-four hours.

The alarm mechanism may be of any preferred construction and is connected with the drop-lever by means of a wire E, which in turn connects with a pallet operated by an escape-wheel G, carrying stop-pins g. The stoplever g is also connected with the drop-lever E and engages with the stop-pins g and also with the trip-wheel H. .As these elements form no part of the present invention, a detailed description is deemed unnecessary.

In describing the operation of my improved alarm-cam let it be supposed that the alarm has just sounded. The arm 6 of the droplever is now resting at the base of the shoulder (6 As the dial C revolves, the said arm travels up the inclined portion 01 of the cam portion and on the track (Z, being held in position by the toe e and passes through the passway 61*, thus locking the alarm mechanism against operation. The arm bears upon this track until the dial has revolved sut'ticiently to bring the passway directly under the arm, when the latter will be shifted to track (1 on which it bears until released by the shoulder (1 thus releasing the alarm mechanism and sounding an alarm. This same opstructed with two tracks, one of which .is camshaped for the purpose of releasing the droplever and the other approximately circular in form and provided with a passway whereby to permit the said lever to pass from the cam portion to the circular track.

2. An alarm attachment for clocks, comprising an alarm-dial carrying a cam constructed with two tracks, one of which is camshaped and the other circular in form and provided with a passway to permit the droplever to pass from the cam portion to the circular portion, the latter portion being arranged in a plane approximately diagonal to that occupied'by the cam portion.

3. An alarm mechanism for clocks, consisting of an alarm-dial carrying a wire bent to form two tracks,one of which is circular and the other cam-shaped and separated at their ends by a passway.

4:. An alarm mechanism forclocks, consisting of an alarm-dial carrying a wire bent to form two tracks, one of which is circular and the other cam-shaped and separated at their ends by a passway, in combination with a drop-lever having a lateral arm provided with a toe designed to engage the said tracks.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES D. BROWN.

Witnesses:

J. L. STEVENS, E. R. CHAMBERLAIN. 

